CodeTrain vs x402 Cloud Simulation API

CodeTrain is a Socratic AI coding tutor: it asks questions, reviews what you write, and runs your tests, but never writes the code for you. Free to start.

How we built native x402 payable API support so AI agents can run simulations and pay per request, no human-in-the-loop billing setup required.

About CodeTrain

CodeTrain is a Socratic AI coding tutor: it asks questions, reviews what you write, and runs your tests, but never writes the code for you. Free to start. Two steps, about a minute, and the first one is going to catch you. The tutor's replies are pre-recorded, so it knows the handful of ways this lesson usually goes wrong. The real one reads whatever you actually wrote, and it is free for ten lessons a month.

About x402 Cloud Simulation API

How we built native x402 payable API support so AI agents can run simulations and pay per request, no human-in-the-loop billing setup required. AI agents can now use the simulation API without human-in-the-loop billing setup, pay in USDC over Base. x402 is an HTTP payment protocol: a server returns 402 Payment Required with a payment challenge, the agent pays on-chain, then re-submits the request with proof. Simulation steps, RL episodes, chaos jobs, multi-cloud analysis, and AI explanations are all payable.